include/media/v4l2-subdev.h

   1 /*
   2     V4L2 sub-device support header.
   3
   4     Copyright (C) 2008  Hans Verkuil <hverkuil@xs4all.nl>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifndef _V4L2_SUBDEV_H
  22 #define _V4L2_SUBDEV_H
  23
  24 #include <linux/v4l2-subdev.h>
  25 #include <media/media-entity.h>
  26 #include <media/v4l2-common.h>
  27 #include <media/v4l2-dev.h>
  28 #include <media/v4l2-fh.h>
  29 #include <media/v4l2-mediabus.h>
  30
  31 /* generic v4l2_device notify callback notification values */
  32 #define V4L2_SUBDEV_IR_RX_NOTIFY                _IOW('v', 0, u32)
  33 #define V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ      0x00000001
  34 #define V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED    0x00000002
  35 #define V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN       0x00000004
  36 #define V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN       0x00000008
  37
  38 #define V4L2_SUBDEV_IR_TX_NOTIFY                _IOW('v', 1, u32)
  39 #define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ      0x00000001
  40
  41 struct v4l2_device;
  42 struct v4l2_ctrl_handler;
  43 struct v4l2_event_subscription;
  44 struct v4l2_fh;
  45 struct v4l2_subdev;
  46 struct v4l2_subdev_fh;
  47 struct tuner_setup;
  48
  49 /* decode_vbi_line */
  50 struct v4l2_decode_vbi_line {
  51         u32 is_second_field;    /* Set to 0 for the first (odd) field,
  52                                    set to 1 for the second (even) field. */
  53         u8 *p;                  /* Pointer to the sliced VBI data from the decoder.
  54                                    On exit points to the start of the payload. */
  55         u32 line;               /* Line number of the sliced VBI data (1-23) */
  56         u32 type;               /* VBI service type (V4L2_SLICED_*). 0 if no service found */
  57 };
  58
  59 /* Sub-devices are devices that are connected somehow to the main bridge
  60    device. These devices are usually audio/video muxers/encoders/decoders or
  61    sensors and webcam controllers.
  62
  63    Usually these devices are controlled through an i2c bus, but other busses
  64    may also be used.
  65
  66    The v4l2_subdev struct provides a way of accessing these devices in a
  67    generic manner. Most operations that these sub-devices support fall in
  68    a few categories: core ops, audio ops, video ops and tuner ops.
  69
  70    More categories can be added if needed, although this should remain a
  71    limited set (no more than approx. 8 categories).
  72
  73    Each category has its own set of ops that subdev drivers can implement.
  74
  75    A subdev driver can leave the pointer to the category ops NULL if
  76    it does not implement them (e.g. an audio subdev will generally not
  77    implement the video category ops). The exception is the core category:
  78    this must always be present.
  79
  80    These ops are all used internally so it is no problem to change, remove
  81    or add ops or move ops from one to another category. Currently these
  82    ops are based on the original ioctls, but since ops are not limited to
  83    one argument there is room for improvement here once all i2c subdev
  84    drivers are converted to use these ops.
  85  */
  86
  87 /* Core ops: it is highly recommended to implement at least these ops:
  88
  89    g_chip_ident
  90    log_status
  91    g_register
  92    s_register
  93
  94    This provides basic debugging support.
  95
  96    The ioctl ops is meant for generic ioctl-like commands. Depending on
  97    the use-case it might be better to use subdev-specific ops (currently
  98    not yet implemented) since ops provide proper type-checking.
  99  */
 100
 101 /* Subdevice external IO pin configuration */
 102 #define V4L2_SUBDEV_IO_PIN_DISABLE      (1 << 0) /* ENABLE assumed */
 103 #define V4L2_SUBDEV_IO_PIN_OUTPUT       (1 << 1)
 104 #define V4L2_SUBDEV_IO_PIN_INPUT        (1 << 2)
 105 #define V4L2_SUBDEV_IO_PIN_SET_VALUE    (1 << 3) /* Set output value */
 106 #define V4L2_SUBDEV_IO_PIN_ACTIVE_LOW   (1 << 4) /* ACTIVE HIGH assumed */
 107
 108 struct v4l2_subdev_io_pin_config {
 109         u32 flags;      /* V4L2_SUBDEV_IO_PIN_* flags for this pin's config */
 110         u8 pin;         /* Chip external IO pin to configure */
 111         u8 function;    /* Internal signal pad/function to route to IO pin */
 112         u8 value;       /* Initial value for pin - e.g. GPIO output value */
 113         u8 strength;    /* Pin drive strength */
 114 };
 115
 116 /*
 117    s_io_pin_config: configure one or more chip I/O pins for chips that
 118         multiplex different internal signal pads out to IO pins.  This function
 119         takes a pointer to an array of 'n' pin configuration entries, one for
 120         each pin being configured.  This function could be called at times
 121         other than just subdevice initialization.
 122
 123    init: initialize the sensor registors to some sort of reasonable default
 124         values. Do not use for new drivers and should be removed in existing
 125         drivers.
 126
 127    load_fw: load firmware.
 128
 129    reset: generic reset command. The argument selects which subsystems to
 130         reset. Passing 0 will always reset the whole chip. Do not use for new
 131         drivers without discussing this first on the linux-media mailinglist.
 132         There should be no reason normally to reset a device.
 133
 134    s_gpio: set GPIO pins. Very simple right now, might need to be extended with
 135         a direction argument if needed.
 136
 137    s_power: puts subdevice in power saving mode (on == 0) or normal operation
 138         mode (on == 1).
 139
 140    interrupt_service_routine: Called by the bridge chip's interrupt service
 141         handler, when an interrupt status has be raised due to this subdev,
 142         so that this subdev can handle the details.  It may schedule work to be
 143         performed later.  It must not sleep.  *Called from an IRQ context*.
 144  */
 145 struct v4l2_subdev_core_ops {
 146         int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip);
 147         int (*log_status)(struct v4l2_subdev *sd);
 148         int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n,
 149                                       struct v4l2_subdev_io_pin_config *pincfg);
 150         int (*init)(struct v4l2_subdev *sd, u32 val);
 151         int (*load_fw)(struct v4l2_subdev *sd);
 152         int (*reset)(struct v4l2_subdev *sd, u32 val);
 153         int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
 154         int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
 155         int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
 156         int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
 157         int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 158         int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 159         int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 160         int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
 161         int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
 162         long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
 163 #ifdef CONFIG_VIDEO_ADV_DEBUG
 164         int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
 165         int (*s_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
 166 #endif
 167         int (*s_power)(struct v4l2_subdev *sd, int on);
 168         int (*interrupt_service_routine)(struct v4l2_subdev *sd,
 169                                                 u32 status, bool *handled);
 170         int (*subscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
 171                                struct v4l2_event_subscription *sub);
 172         int (*unsubscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
 173                                  struct v4l2_event_subscription *sub);
 174 };
 175
 176 /* s_radio: v4l device was opened in radio mode.
 177
 178    g_frequency: freq->type must be filled in. Normally done by video_ioctl2
 179         or the bridge driver.
 180
 181    g_tuner:
 182    s_tuner: vt->type must be filled in. Normally done by video_ioctl2 or the
 183         bridge driver.
 184
 185    s_type_addr: sets tuner type and its I2C addr.
 186
 187    s_config: sets tda9887 specific stuff, like port1, port2 and qss
 188  */
 189 struct v4l2_subdev_tuner_ops {
 190         int (*s_radio)(struct v4l2_subdev *sd);
 191         int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
 192         int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
 193         int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
 194         int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
 195         int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
 196         int (*s_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
 197         int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
 198         int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
 199 };
 200
 201 /* s_clock_freq: set the frequency (in Hz) of the audio clock output.
 202         Used to slave an audio processor to the video decoder, ensuring that
 203         audio and video remain synchronized. Usual values for the frequency
 204         are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
 205         -EINVAL is returned.
 206
 207    s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
 208         way to select I2S clock used by driving digital audio streams at some
 209         board designs. Usual values for the frequency are 1024000 and 2048000.
 210         If the frequency is not supported, then -EINVAL is returned.
 211
 212    s_routing: used to define the input and/or output pins of an audio chip,
 213         and any additional configuration data.
 214         Never attempt to use user-level input IDs (e.g. Composite, S-Video,
 215         Tuner) at this level. An i2c device shouldn't know about whether an
 216         input pin is connected to a Composite connector, become on another
 217         board or platform it might be connected to something else entirely.
 218         The calling driver is responsible for mapping a user-level input to
 219         the right pins on the i2c device.
 220  */
 221 struct v4l2_subdev_audio_ops {
 222         int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
 223         int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
 224         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
 225         int (*s_stream)(struct v4l2_subdev *sd, int enable);
 226 };
 227
 228 /*
 229    s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
 230         video input devices.
 231
 232    g_std_output: get current standard for video OUTPUT devices. This is ignored
 233         by video input devices.
 234
 235    g_tvnorms_output: get v4l2_std_id with all standards supported by video
 236         OUTPUT device. This is ignored by video input devices.
 237
 238    s_crystal_freq: sets the frequency of the crystal used to generate the
 239         clocks in Hz. An extra flags field allows device specific configuration
 240         regarding clock frequency dividers, etc. If not used, then set flags
 241         to 0. If the frequency is not supported, then -EINVAL is returned.
 242
 243    g_input_status: get input status. Same as the status field in the v4l2_input
 244         struct.
 245
 246    s_routing: see s_routing in audio_ops, except this version is for video
 247         devices.
 248
 249    s_dv_preset: set dv (Digital Video) preset in the sub device. Similar to
 250         s_std()
 251
 252    g_dv_preset: get current dv (Digital Video) preset in the sub device.
 253
 254    query_dv_preset: query dv preset in the sub device. This is similar to
 255         querystd()
 256
 257    s_dv_timings(): Set custom dv timings in the sub device. This is used
 258         when sub device is capable of setting detailed timing information
 259         in the hardware to generate/detect the video signal.
 260
 261    g_dv_timings(): Get custom dv timings in the sub device.
 262
 263    enum_mbus_fmt: enumerate pixel formats, provided by a video data source
 264
 265    g_mbus_fmt: get the current pixel format, provided by a video data source
 266
 267    try_mbus_fmt: try to set a pixel format on a video data source
 268
 269    s_mbus_fmt: set a pixel format on a video data source
 270
 271    g_mbus_config: get supported mediabus configurations
 272
 273    s_mbus_config: set a certain mediabus configuration. This operation is added
 274         for compatibility with soc-camera drivers and should not be used by new
 275         software.
 276  */
 277 struct v4l2_subdev_video_ops {
 278         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
 279         int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
 280         int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
 281         int (*g_std_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
 282         int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
 283         int (*g_tvnorms_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
 284         int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
 285         int (*s_stream)(struct v4l2_subdev *sd, int enable);
 286         int (*cropcap)(struct v4l2_subdev *sd, struct v4l2_cropcap *cc);
 287         int (*g_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
 288         int (*s_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
 289         int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
 290         int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
 291         int (*g_frame_interval)(struct v4l2_subdev *sd,
 292                                 struct v4l2_subdev_frame_interval *interval);
 293         int (*s_frame_interval)(struct v4l2_subdev *sd,
 294                                 struct v4l2_subdev_frame_interval *interval);
 295         int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize);
 296         int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival);
 297         int (*enum_dv_presets) (struct v4l2_subdev *sd,
 298                         struct v4l2_dv_enum_preset *preset);
 299         int (*s_dv_preset)(struct v4l2_subdev *sd,
 300                         struct v4l2_dv_preset *preset);
 301         int (*g_dv_preset)(struct v4l2_subdev *sd,
 302                         struct v4l2_dv_preset *preset);
 303         int (*query_dv_preset)(struct v4l2_subdev *sd,
 304                         struct v4l2_dv_preset *preset);
 305         int (*s_dv_timings)(struct v4l2_subdev *sd,
 306                         struct v4l2_dv_timings *timings);
 307         int (*g_dv_timings)(struct v4l2_subdev *sd,
 308                         struct v4l2_dv_timings *timings);
 309         int (*enum_mbus_fmt)(struct v4l2_subdev *sd, unsigned int index,
 310                              enum v4l2_mbus_pixelcode *code);
 311         int (*enum_mbus_fsizes)(struct v4l2_subdev *sd,
 312                              struct v4l2_frmsizeenum *fsize);
 313         int (*g_mbus_fmt)(struct v4l2_subdev *sd,
 314                           struct v4l2_mbus_framefmt *fmt);
 315         int (*try_mbus_fmt)(struct v4l2_subdev *sd,
 316                             struct v4l2_mbus_framefmt *fmt);
 317         int (*s_mbus_fmt)(struct v4l2_subdev *sd,
 318                           struct v4l2_mbus_framefmt *fmt);
 319         int (*g_mbus_config)(struct v4l2_subdev *sd,
 320                              struct v4l2_mbus_config *cfg);
 321         int (*s_mbus_config)(struct v4l2_subdev *sd,
 322                              const struct v4l2_mbus_config *cfg);
 323 };
 324
 325 /*
 326    decode_vbi_line: video decoders that support sliced VBI need to implement
 327         this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the
 328         start of the VBI data that was generated by the decoder. The driver
 329         then parses the sliced VBI data and sets the other fields in the
 330         struct accordingly. The pointer p is updated to point to the start of
 331         the payload which can be copied verbatim into the data field of the
 332         v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the
 333         type field is set to 0 on return.
 334
 335    s_vbi_data: used to generate VBI signals on a video signal.
 336         v4l2_sliced_vbi_data is filled with the data packets that should be
 337         output. Note that if you set the line field to 0, then that VBI signal
 338         is disabled. If no valid VBI data was found, then the type field is
 339         set to 0 on return.
 340
 341    g_vbi_data: used to obtain the sliced VBI packet from a readback register.
 342         Not all video decoders support this. If no data is available because
 343         the readback register contains invalid or erroneous data -EIO is
 344         returned. Note that you must fill in the 'id' member and the 'field'
 345         member (to determine whether CC data from the first or second field
 346         should be obtained).
 347
 348    s_raw_fmt: setup the video encoder/decoder for raw VBI.
 349
 350    g_sliced_fmt: retrieve the current sliced VBI settings.
 351
 352    s_sliced_fmt: setup the sliced VBI settings.
 353  */
 354 struct v4l2_subdev_vbi_ops {
 355         int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
 356         int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
 357         int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
 358         int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
 359         int (*s_raw_fmt)(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt);
 360         int (*g_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
 361         int (*s_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
 362 };
 363
 364 /**
 365  * struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
 366  * @g_skip_top_lines: number of lines at the top of the image to be skipped.
 367  *                    This is needed for some sensors, which always corrupt
 368  *                    several top lines of the output image, or which send their
 369  *                    metadata in them.
 370  * @g_skip_frames: number of frames to skip at stream start. This is needed for
 371  *                 buggy sensors that generate faulty frames when they are
 372  *                 turned on.
 373  */
 374 struct v4l2_subdev_sensor_ops {
 375         int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
 376         int (*g_skip_frames)(struct v4l2_subdev *sd, u32 *frames);
 377 };
 378
 379 /*
 380    [rt]x_g_parameters: Get the current operating parameters and state of the
 381         the IR receiver or transmitter.
 382
 383    [rt]x_s_parameters: Set the current operating parameters and state of the
 384         the IR receiver or transmitter.  It is recommended to call
 385         [rt]x_g_parameters first to fill out the current state, and only change
 386         the fields that need to be changed.  Upon return, the actual device
 387         operating parameters and state will be returned.  Note that hardware
 388         limitations may prevent the actual settings from matching the requested
 389         settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
 390         was requested.  An exception is when the shutdown parameter is true.
 391         The last used operational parameters will be returned, but the actual
 392         state of the hardware be different to minimize power consumption and
 393         processing when shutdown is true.
 394
 395    rx_read: Reads received codes or pulse width data.
 396         The semantics are similar to a non-blocking read() call.
 397
 398    tx_write: Writes codes or pulse width data for transmission.
 399         The semantics are similar to a non-blocking write() call.
 400  */
 401
 402 enum v4l2_subdev_ir_mode {
 403         V4L2_SUBDEV_IR_MODE_PULSE_WIDTH, /* uses struct ir_raw_event records */
 404 };
 405
 406 struct v4l2_subdev_ir_parameters {
 407         /* Either Rx or Tx */
 408         unsigned int bytes_per_data_element; /* of data in read or write call */
 409         enum v4l2_subdev_ir_mode mode;
 410
 411         bool enable;
 412         bool interrupt_enable;
 413         bool shutdown; /* true: set hardware to low/no power, false: normal */
 414
 415         bool modulation;           /* true: uses carrier, false: baseband */
 416         u32 max_pulse_width;       /* ns,      valid only for baseband signal */
 417         unsigned int carrier_freq; /* Hz,      valid only for modulated signal*/
 418         unsigned int duty_cycle;   /* percent, valid only for modulated signal*/
 419         bool invert_level;         /* invert signal level */
 420
 421         /* Tx only */
 422         bool invert_carrier_sense; /* Send 0/space as a carrier burst */
 423
 424         /* Rx only */
 425         u32 noise_filter_min_width;       /* ns, min time of a valid pulse */
 426         unsigned int carrier_range_lower; /* Hz, valid only for modulated sig */
 427         unsigned int carrier_range_upper; /* Hz, valid only for modulated sig */
 428         u32 resolution;                   /* ns */
 429 };
 430
 431 struct v4l2_subdev_ir_ops {
 432         /* Receiver */
 433         int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
 434                                 ssize_t *num);
 435
 436         int (*rx_g_parameters)(struct v4l2_subdev *sd,
 437                                 struct v4l2_subdev_ir_parameters *params);
 438         int (*rx_s_parameters)(struct v4l2_subdev *sd,
 439                                 struct v4l2_subdev_ir_parameters *params);
 440
 441         /* Transmitter */
 442         int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
 443                                 ssize_t *num);
 444
 445         int (*tx_g_parameters)(struct v4l2_subdev *sd,
 446                                 struct v4l2_subdev_ir_parameters *params);
 447         int (*tx_s_parameters)(struct v4l2_subdev *sd,
 448                                 struct v4l2_subdev_ir_parameters *params);
 449 };
 450
 451 struct v4l2_subdev_pad_ops {
 452         int (*enum_mbus_code)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 453                               struct v4l2_subdev_mbus_code_enum *code);
 454         int (*enum_frame_size)(struct v4l2_subdev *sd,
 455                                struct v4l2_subdev_fh *fh,
 456                                struct v4l2_subdev_frame_size_enum *fse);
 457         int (*enum_frame_interval)(struct v4l2_subdev *sd,
 458                                    struct v4l2_subdev_fh *fh,
 459                                    struct v4l2_subdev_frame_interval_enum *fie);
 460         int (*get_fmt)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 461                        struct v4l2_subdev_format *format);
 462         int (*set_fmt)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 463                        struct v4l2_subdev_format *format);
 464         int (*set_crop)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 465                        struct v4l2_subdev_crop *crop);
 466         int (*get_crop)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 467                        struct v4l2_subdev_crop *crop);
 468 };
 469
 470 struct v4l2_subdev_ops {
 471         const struct v4l2_subdev_core_ops       *core;
 472         const struct v4l2_subdev_tuner_ops      *tuner;
 473         const struct v4l2_subdev_audio_ops      *audio;
 474         const struct v4l2_subdev_video_ops      *video;
 475         const struct v4l2_subdev_vbi_ops        *vbi;
 476         const struct v4l2_subdev_ir_ops         *ir;
 477         const struct v4l2_subdev_sensor_ops     *sensor;
 478         const struct v4l2_subdev_pad_ops        *pad;
 479 };
 480
 481 /*
 482  * Internal ops. Never call this from drivers, only the v4l2 framework can call
 483  * these ops.
 484  *
 485  * registered: called when this subdev is registered. When called the v4l2_dev
 486  *      field is set to the correct v4l2_device.
 487  *
 488  * unregistered: called when this subdev is unregistered. When called the
 489  *      v4l2_dev field is still set to the correct v4l2_device.
 490  *
 491  * open: called when the subdev device node is opened by an application.
 492  *
 493  * close: called when the subdev device node is closed.
 494  */
 495 struct v4l2_subdev_internal_ops {
 496         int (*registered)(struct v4l2_subdev *sd);
 497         void (*unregistered)(struct v4l2_subdev *sd);
 498         int (*open)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
 499         int (*close)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
 500 };
 501
 502 #define V4L2_SUBDEV_NAME_SIZE 32
 503
 504 /* Set this flag if this subdev is a i2c device. */
 505 #define V4L2_SUBDEV_FL_IS_I2C                   (1U << 0)
 506 /* Set this flag if this subdev is a spi device. */
 507 #define V4L2_SUBDEV_FL_IS_SPI                   (1U << 1)
 508 /* Set this flag if this subdev needs a device node. */
 509 #define V4L2_SUBDEV_FL_HAS_DEVNODE              (1U << 2)
 510 /* Set this flag if this subdev generates events. */
 511 #define V4L2_SUBDEV_FL_HAS_EVENTS               (1U << 3)
 512
 513 /* Each instance of a subdev driver should create this struct, either
 514    stand-alone or embedded in a larger struct.
 515  */
 516 struct v4l2_subdev {
 517 #if defined(CONFIG_MEDIA_CONTROLLER)
 518         struct media_entity entity;
 519 #endif
 520         struct list_head list;
 521         struct module *owner;
 522         u32 flags;
 523         struct v4l2_device *v4l2_dev;
 524         const struct v4l2_subdev_ops *ops;
 525         /* Never call these internal ops from within a driver! */
 526         const struct v4l2_subdev_internal_ops *internal_ops;
 527         /* The control handler of this subdev. May be NULL. */
 528         struct v4l2_ctrl_handler *ctrl_handler;
 529         /* name must be unique */
 530         char name[V4L2_SUBDEV_NAME_SIZE];
 531         /* can be used to group similar subdevs, value is driver-specific */
 532         u32 grp_id;
 533         /* pointer to private data */
 534         void *dev_priv;
 535         void *host_priv;
 536         /* subdev device node */
 537         struct video_device devnode;
 538 };
 539
 540 #define media_entity_to_v4l2_subdev(ent) \
 541         container_of(ent, struct v4l2_subdev, entity)
 542 #define vdev_to_v4l2_subdev(vdev) \
 543         container_of(vdev, struct v4l2_subdev, devnode)
 544
 545 /*
 546  * Used for storing subdev information per file handle
 547  */
 548 struct v4l2_subdev_fh {
 549         struct v4l2_fh vfh;
 550 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 551         struct v4l2_mbus_framefmt *try_fmt;
 552         struct v4l2_rect *try_crop;
 553 #endif
 554 };
 555
 556 #define to_v4l2_subdev_fh(fh)   \
 557         container_of(fh, struct v4l2_subdev_fh, vfh)
 558
 559 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 560 static inline struct v4l2_mbus_framefmt *
 561 v4l2_subdev_get_try_format(struct v4l2_subdev_fh *fh, unsigned int pad)
 562 {
 563         return &fh->try_fmt[pad];
 564 }
 565
 566 static inline struct v4l2_rect *
 567 v4l2_subdev_get_try_crop(struct v4l2_subdev_fh *fh, unsigned int pad)
 568 {
 569         return &fh->try_crop[pad];
 570 }
 571 #endif
 572
 573 extern const struct v4l2_file_operations v4l2_subdev_fops;
 574
 575 static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
 576 {
 577         sd->dev_priv = p;
 578 }
 579
 580 static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
 581 {
 582         return sd->dev_priv;
 583 }
 584
 585 static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
 586 {
 587         sd->host_priv = p;
 588 }
 589
 590 static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
 591 {
 592         return sd->host_priv;
 593 }
 594
 595 void v4l2_subdev_init(struct v4l2_subdev *sd,
 596                       const struct v4l2_subdev_ops *ops);
 597
 598 /* Call an ops of a v4l2_subdev, doing the right checks against
 599    NULL pointers.
 600
 601    Example: err = v4l2_subdev_call(sd, core, g_chip_ident, &chip);
 602  */
 603 #define v4l2_subdev_call(sd, o, f, args...)                             \
 604         (!(sd) ? -ENODEV : (((sd)->ops->o && (sd)->ops->o->f) ? \
 605                 (sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD))
 606
 607 /* Send a notification to v4l2_device. */
 608 #define v4l2_subdev_notify(sd, notification, arg)                          \
 609         ((!(sd) || !(sd)->v4l2_dev || !(sd)->v4l2_dev->notify) ? -ENODEV : \
 610          (sd)->v4l2_dev->notify((sd), (notification), (arg)))
 611
 612 #endif